DESCRIPTION
●The 8-pin LT® 1249 provides active power factor correction for universal offline power systems with very few
●external parts. By using fixed high frequency PWM current averaging without the need for slope ompensation, the LT1249 achieves far lower line current distortion, with a smaller magnetic element than systems that use either peak current detection or zero current switching approach, in both continuous and discontinuous modes of operation.
●FEATURES
●■ Standard 8-Pin Packages
●■ High Power Factor Over Wide Load Range with Line Current Averaging
●■ International Operation Without Switches
●■ Instantaneous Overvoltage Protection
●■ Minimal Line Current Dead Zone
●■ Typical 250µA Start-Up Supply Current
●■ Rejects Line Switching Noise
●■ Synchronization Capability
●■ Low Quiescent Current: 9mA
●■ Fast 1.5A Peak Current Gate Driver
●APPLICATIONS
●■ Universal Power Factor Corrected Power Supplies
●■ Preregulators up to 1500W
